Hibernate Envers 无法 "locate getter method for property" for Embeddable table

Question

我有一个带有@Audit 注释的class，如下所示

@Entity
@Audited(withModifiedFlag=true)
@Table(name = "PERIODICITY")
public class Periodicity implements java.io.Serializable {

private PeriodicityId id;
private String frequency;

@EmbeddedId
@AttributeOverrides({
        @AttributeOverride(name = "instrumentId", column = @Column(name = "INSTRUMENT_ID", nullable = false, precision = 22, scale = 0)),
        @AttributeOverride(name = "legType", column = @Column(name = "LEG_TYPE", nullable = false, precision = 38, scale = 0))})
public PeriodicityId getId() {
    return this.id;
}
public void setId(PeriodicityId id) {
    this.id = id;
}
@Column(name = "FREQUENCY", nullable = false, length = 20)
public String getFrequency() {
    return this.frequency;
}
}

而嵌入的class如下

@Embeddable
public class PeriodicityId implements java.io.Serializable {

private Long instrumentId;
private Long legType;
@Column(name = "INSTRUMENT_ID", nullable = false, precision = 22, scale = 0)
public Long getInstrumentId() {
    return this.instrumentId;
}

public void setInstrumentId(Long instrumentId) {
    this.instrumentId = instrumentId;
}

@Column(name = "LEG_TYPE", nullable = false, precision = 38, scale = 0)
public Long getLegType() {
    return this.legType;
}
}

并通过审计 reader 我试图在特定修订中找到审计，如下所示

Session session = HibernateUtil.currentSession();
AuditReader reader = AuditReaderFactory.get(session);

Periodicity periodicity = reader.find( Periodicity.class, instrumentId, revision_Id);

但它给出了异常

org.hibernate.PropertyNotFoundException: Could not locate getter method for property [java.lang.Long#instrumentId]
at org.hibernate.internal.util.ReflectHelper.findGetterMethod(ReflectHelper.java:408)
at org.hibernate.property.access.internal.PropertyAccessBasicImpl.<init>(PropertyAccessBasicImpl.java:41)
at org.hibernate.property.access.internal.PropertyAccessStrategyBasicImpl.buildPropertyAccess(PropertyAccessStrategyBasicImpl.java:27)
at org.hibernate.envers.internal.tools.ReflectionTools.getGetter(ReflectionTools.java:53)

请帮助如何访问 Embeddable class 的属性..

Answer 1

为了后代，我会在这里添加我在 HipChat 中提到的内容。

您打算做的是通过指定复合 ID class 的特定值来使用 AuditReader#find 方法。您正在使用的方法签名需要实际的 embeddable class 而不是可嵌入包含的特定属性类型。

AuditReader#find 的正确用法如下：

// define your embeddable class attributes
final PeriodicityId id = new PeriodicityId();
id.setInstrumentId( instrumentId );

// lookup revision 1
final Number revisionId = 1; 

// query
final AuditReader auditReader = AuditReaderFactory.get( session );
auditReader.find( Periodicity.class, id, revisionId );

虽然这避免了您遇到的异常，但此不会给您预期的结果，因为 embeddable 谓词将假设您'对 Perodicity 个 legType 属性 为 null 的实例感兴趣，这不是您的目标。

完成任务目标的唯一方法是使用 Envers 即席查询功能，您可以在其中指定精确的谓词来定位您感兴趣的结果。

final AuditReader auditReader = AuditReaderFactory.get( session );
List results = auditReader.createQuery()
  .forRevisionsOfEntity( Periodicity.class, true, false )
  // add the revision number predicate
  .add( AuditEntity.revisionNumber().eq( revisionId ) )
  // add the instrument predicate
  .add( AuditEntity.property( "id.instrumentId" ).eq( instrumentId ) )
  .getResultList();

希望对您有所帮助。

Hibernate Envers 无法 "locate getter method for property" for Embeddable table

Hibernate Envers is not able to "locate getter method for property" for Embeddable table

java

hibernate

hibernate-envers